Glue applying tool



June 10, 1941.

SEJARTO GLUE APPLYING TOOL Filed June 25, 1940 INVENTOR Patented June 10, 1941 UNITED STATES PATENT OFFICE 8 Claims.

This invention relates to improvements in lue applying tool, and the object of the invention is to provide a tool that can be conveniently operated with one hand to first charge the tool with glue, and then discharge same in a continuous ribbon of uniform volume.

The tool of this invention is particularly useful in connection with Wooden pattern making for the production of foundry castings. In such patterns it is frequently necessary to apply fillets in order to round out sharp corners in the pattern where two parts are joined together. These fillets usually consist of triangular strips of leather which are glued to the adjacent walls where joints occur, and which particular places are often awkward to reach. The usual practice is to apply the glue with a brush, but too much or too little glue so applied is objectionable. With my improved tool however a rapid and even application of the glue is easily 'accomplished in the form of a round ribbon placed in a line along the joint, so that the fillet may be pressed into place with the other hand of the operator as the tool is advanced.

In this manner the application of the glue is quickly followed by the application of the fillet, which latter operation resulting in a squeezing of the glue outwardly to properly cover the contiguous surfaces intended to adhere, and without waste or the undesirable extrusion of the glue beyond opposite edges of the fillet.

For convenience in reaching deeper or more inaccessible parts of the pattern, means are provided for the substitution of various lengths and shapes of nozzles, which may be readily attached to the tool for such purposes.

Another object of the invention resides in a structure that is suitable for applying the glue without any objectionable forcing of air therethrough as the glue is discharged from the tool, and which would otherwise tend to interrupt the smooth continuity of the ribbon.

These and other objects of the invention will be more apparent from the specification and drawing forming a part thereof, and in which drawing:

Figure 1 is a side elevation of my improved glue applying tool.

Figure 2 is a plan view of same.

Figure 3 is a vertical section on the line 3-3 of Figure 2, and,

Figure 4 is a. perspective view illustrating the manner in which the tool may be used.

Referring to the drawing, an embodiment of the invention illustrated consists of a tool comprising four parts, namely, a body member II], a

plunger II, a clamping ring I2, and adetachable nozzle I3, all of which parts may be assembled in the manner shown in Figure 3.

The \body member I0 is generally conical in shape, converging at the lower end into a cylindrical portion I I, recessed at I4, the surrounding walls of which being internally threaded to receive an externally threaded boss I5 on the nozzle I3, and which projects upwardly from a knurled annular flange I6. Below the flange the nozzle is tapered at an acute angle to provide a slender bluntly pointed tip IT. The nozzle is bored for a short distance above the tip to provide an outlet opening I8 of approximate- 1y .025" in diameter, and counterbored through, as at I8, with a diameter of approximately onesixteenth of an inch. The top surface I9 of the boss I5, and a surface at the top of the recess I4, are machined for the provision of a tight joint when these surfaces are brought into snug engagement.

Body member I0 is flared outwardly at the top to form an annular flange 20, which may be externally threaded for engagement with internal threads 2| formed within a recess 22 in the lower'face of the ring l2. The flange 20 is provided with an annular V-shaped groove 23 in the upper face thereof. Body member I0 is hollow, constituting a chamber I 0 open at the top and of a configuration approximating that of the outer contour ofthe body member, but said lchamber terminates in a blunt point at its lower extremity above the top of recess I 4. Communication between the chamber and the counterbore I8 of the nozzle I3, is provided by a passageway 24 drilled through the cylindrical portion l4.

The plunger II is of particular design and material for a purpose which will presently appear. It is preferably made of soft rubber, or similar elastic material, and has a frustro-conical part 25 adapted to fit loosely within the frustro-coni cal portion of chamber I0 of the body member ID, the contiguous sloping walls of both being substantially complementary in shape, and the clearance shown therebetween at 26', being approximately one-sixteenth of an inch. Plunger II does not extend fully to the lower end of the chamber II! when in the position shown in Figure 3, but terminates at a point somewhat above the lower end of the chamber to provide a space 26 into which the plunger may be depressed, and substantially corresponding in depth to the distance the plunger requires to move in order to fully occupy the lower portion of the chamber with its surrounding walls engaging those of the chamber.

The upper end of plunger ll flares outwardly in the same manner as the body member, to provide an annular flange 21 constituting an elastic diaphragm, and which has an annular bead 28 formed on its lower face shaped to fit within the groove 23.

The clamping ring i2 is provided with an annular inwardly extending flange 29 the Walls of which slope downwardly in such manner as to engage the top surface of the plunger flange 21. It will now be apparent that when the plunger ll is positioned within body member Ill, and the knurled ring [2 is screwed down firmly in place, flange 29 will press on flange 21, and bead 28 will be thereby anchored in groove 23, to thus lock the plunger firmly in place, and at the same time a tight joint will be established around the top of chamber l.

Extending upwardly from the plunger I l, and in axial alignment therewith, is a thumb button 36, which may be moulded with the plunger as an integral part thereof.

In use, the tool may be held in the manner of an oil can, with the index finger and second finger disposed diametrically beneath the ring I2 and flange 26. If the button 30 be then pressed bythe thumb, the plunger may be moved downwardly into the space 26, stretching the walls of the diaphragm 21 as a result of the outer extremity thereof being firmly anchored to flange 20. At the same time the surrounding Walls of the part 25 of the plunger will move toward and come into engagement with the adjacent walls of the chamber l0, and air thus displaced with be expelled from the chamber through the nozzle 13. If the nozzle is now held submerged in liquid glue, and the pressure on the button 3!! is relieved, the following reactance of the rubber of the Walls of the diaphragm will cause the plunger to move upwardly, and a charge of glue will be drawn through the described passageways, and into the space 26, and also well up into the clearance space 25'. The proportions are such as to result in substantially filling the passageways and the clearances in the chamber with glue, and upon reapplying pressure with the thumb the relatively small volume of air trapped above the glue may be forced out of the tool through the glue, but glue will still remain in the passageways below the chamber. With the plunger still held depressed the end of the tool may then be submerged again in the glue, and upon removal of pressure on button 30, a charge of glue may be drawn into the tool, but chamber It? will now be free of any air above the glue, and the adhesive may then be expelled for the purpose set forth, but without any objectionable bursting through of air that would otherwise destroy the desired con tinuous flow of the glue from the tool.

The capacity of the clearance 26' around the plunger It in relation to the capacity of the space 26 beneath it, together with that of the combined passageways 24, i8, and I8, is manifestly far greater, and because of this characteristic the proportion of glue initially drawn into the tool with respect to the air trapped above it will result in a high ratio of glue, and when the plunger is again depressed the tool may be readily freed of such air in the manner described.

The inclined walls of chamber l0 and those of the part 25 of the plunger ll cooperate to cause the glue to be squeezed out of the space 26, and on out of the tool. It will be apparent that these cooperating walls are preliminarily effective at the top of the chamber where space 26 converges, and containing the aforesaid trapped air, so that as the plunger is depressed pressure will be first applied around the top of the chamber. After the tool has been freed of trapped air none may again enter so long as passageways E l, I3 and 68 remain filled with glue. Thus the tool once freed of air may be repeatedly charged and emptied during consecutive applications of glue to the pattern.

Longer nozzles may be readily substituted as will be obvious, or one curving away from a straight line for use in reaching obscure places in the pattern, and for reasons above stated any resulting elongation of the passageways through such nozzles will not materially affect the aforesaid ratio of the trapped air to the charge of glue in the tool.

It will be seen in Figure 4 that a ribbon of glue 3| may be applied conveniently with one hand, and that a fillet 32 may be simultaneously applied with the other hand to a pattern such as shown at 33, the extent and volume of the glue so applied being more definitely under the control of the operator, and only enough being applied to meet the necessary coverage of the surface of the fillet, which when pressed into place will cause the glue to be squeezed into a suitable film for the proper adhesion of the fillet to the contiguous walls of the pattern.

The construction of the tool is such, that at the end of the life of the plunger element a new one may be quickly substituted and the usefulness of the tool prolonged indefinitely.

The foregoing description is merely illustrative and not intended as limiting the invention thereto.

I claim:

1. A glue applying tool comprising a body member having a conical chamber therein open at its upper end of major diameter, a nozzle at the lower end of said body member having an opening therethrough leading to the lower end of said chamber, a conical plunger of soft elastic material adapted to fit loosely within said chamber, and terminating above the lower end thereof. so as to be capable of longitudinal movement in said chamber, outwardly flaring walls at the upper end of the body member forming an annular flange, the upper end of said plunger having outwardly extending relatively thin walls constituting a diaphragm and terminating in an annular flange overlying the flange of the body member, and a clamping member removably secured to said body member flange, and having an annular flange overlying the flange of said diaphragm, whereby the pressure of said clamping member will compress said diaphragm flange between the flanges of the body member and the clamping member to close and seal said chamber.

2. The structure set forth in claim 1, in which there are means for anchoring the flange of said diaphragm to that of said body member consisting of an annular groove in one of said flanges, and an annular bead on the other, adapted to engage each other.

3. In a tool of the kind described, the combination consisting of a body member having a conical chamber therein open at its upper end of major diameter, and having an outlet at its lower end, a combined plunger and diaphragm comprising a solid conical part, and a recessed upper part consisting of elastic annular walls surrounding said recess and constituting said diaphragm, said walls diverging to provide an integral flange extending in a plane substantially normal to the axis of said plunger, the said conical lower part depending loosely within said chamber in spaced relation to the bottom and side walls thereof, and the said flange of the upper part being supported on the top of said body member, a clamping member secured to the top of the body mem her and adapted to compress said integral flange and seal the open end of said chamber.

4. The combination set forth in claim 3, in which the depth of said clearance beneath the lower end of said plunger substantially corresponds to the distance the plunger may be depressed manually to effect an engagement of its surrounding walls with those of the said chamber, whereby said combined plunger and dia-- phragm will then fully occupy said chamber for the purpose set forth.

5. In a glue applying tool the combination of a body member having a chamber therein substantially conical in shape the larger end of which is uppermost and open, an elastic diaphragm secured to said body member and adapted to close and seal the open end of said chamber, said body member having an outlet of relatively small diameter leading to said chamber, a conical plunger carried by said diaphragm, loosely depending within said chamber and terminating above the lower end thereof so as to be capable of longitudinal movement, whereby when said plunger is fully depressed substantially the entire contents of said chamber will be displaced thereby.

6. The combination set forth in claim 5, in which there are means for anchoring the outer edge of said diaphragm to said body member consisting of an annular bead and groove respectively forming a part of said elements and adapted to engage each other.

7. A glue applying tool comprising a body member having a conical chamber therein open and flaring outwardly at its upper larger end, a nozzle detachably secured to the lower end of said body member, and having an opening therethrough leading to said chamber, a conical plunger adapted to fit loosely within said chamher in spaced relation to the surrounding walls thereof, and terminating above the lower end of the chamber so as to be capable of longitudinal movement in said chamber, the upper part of said plunger having outwardly flaring walls constituting an elastic diaphragm and overlying the flaring walls of said chamber, the said flaring walls of the plunger and those of the chamber converging upwardly toward their point of con tact, a thumb button projecting upwardly from and in axial alignment with said plunger, a clamping member removably secured to the top of said body member, and having an annular flange overlying the rim of said diaphragm adapted to compress same and to close and seal said chamber, the engaging parts of the body member and diaphragm having an annular groove in one and a bead on the other effective for preventing lateral displacement of the diaphragm.

8. In a glue applying tool the combination of a body member having a chamber therein open at its upper end, an elastic diaphragm secured to said body member and adapted to close and seal the open end of said chamber, said body member having an outlet opening of relatively small diameter leading to said chamber, a plunger carried by said diaphragm, and loosely depending within said chamber in spaced relation to the bottom and side walls thereof so as to be capable of longitudinal movement, whereby when said plunger is fully depressed substantially the entire contents of said chamber will be displaced thereby.

LESTER SEJARTO. 

